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I-502 Evaluation Plan and Preliminary Report on Implementation

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Adam Darnell - September 2015

Initiative 502, passed by Washington voters in November 2012, legalized the limited adult possession and private consumption of cannabis, as well as its licensed production and sale. The initiative directs WSIPP to evaluate the impact of the law in a series of reports between 2015 and 2032.

It is too early in the history of I-502 to evaluate outcomes. This first required report describes the research plan for the overall study and presents preliminary data on the status of implementation of the law as of June 30, 2015. Ultimately, WSIPP’s evaluation will include a full descriptive study of implementation; an outcome study to identify causal effects of the law on a range of outcomes (e.g., substance use and abuse, health, criminal justice, traffic safety); and a benefit-cost analysis of the net economic impact of the law.

Report ID: 15-09-3201

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